Method of treating cotton fabric and product



Patented June 2, 1936 METHOD OF TREATING COTTON FABRIC AND PRODUCT Clarence B..White, omma, N. J., assignor to Wm. E. Hooper & Sons Company, Baltimore,

Md., a corporation of Maryland No Drawing. Application September 14, 1983, Serial N- 689,434

- Claims.

The method of treating cotton cloth with cupra ammonium solution, the accepted symbol for the cupra ammonium being Cu(NH3) 2, has for many years been well known and practiced to a con-' siderable extent in the production of a waterproof and weather-proof cotton cloth of a bright green color. This color is due to the dissolution of thesurfaces of the fibers which are exposed and the formation with the dissolved cellulose of a combination 'of a copper salt and cellulose, which liquid. "This coating is waterproof. It has since been found desirable to make a waterproof cloth of a darker color by subsequently treating the fabric which has been first treated as described with an alkaline sulphide, as sodium, potassium or ammonium sulphide, changing the coating to one of cupric sulphide and cellulose. This treatmenthas not. proved entirely satisfactory because of the tendency of the coating thus formed to oxidize in the air more or less irregularly, forming sulphates of copper which are of a relatively light brown color and less resistive to weather conditions than the remainder of the surface thus treated.

The object of the invention is to prepare a fabric in this way and. at the same time to avoid I and preventthe oxidation of. the cupric sulphide formed as above described; This in the preferred form of the invention is accomplished by combining with this solution materials of which glucose, corn syrup and invert sugar are good examples. It has also been ascertained that any and all of metallic soaps, or the like, which form a film,

which further protects the cupric sulphide coating from oxidation. The fabric thus treated is of a dark brown or nearly black color of a glossy appearance resembling finished ebony, and it is weather-proof and waterproof to a high degree,

' so. retaining these properties for an indefinite period.

I'have thus described the method and product combination coats the fibers when exposed to the ,the saccharose group which are of a colloidal of my invention, the description being specific and in detail, in order that the method of practicing the invention and the nature of the result-; ing product may be clearly understood. However, the specific terms herein are used in a de- 6 scriptive rather than in a limiting sense, the scope of the invention being defined in the claims.

What'I claim as new and desire to secure by Letters Patent is:

1. A cotton fabric having its fibers coated with m cupric sulphide combined with cellulose, constituting part of said fibers, the coating also including a sugar selected from the group consisting of corn syrup, glucose or invert sugar to prevent oxidation of the cupric sulphide.

I 2. A cotton fabric having its fibers coated with cupric sulphide combined with cellulose, constituting part of said fibers, the coating also including a sugar selected from thegroup consisting of co syrup, invert sugar or glucose, to prevent go oxi tion of the cupric sulphide, the fabric being impregnated with a resinous material.

tion of cupra ammonium and treating the same g with an alkaline sulphide solution, the alkaline solution containing mixed therein a sugar selected 85 from the group-consisting of corn syrup, glucose or invert sugar, to prevent oxidation of the resulting sulphides, and finally impr nating said treated fabric with a resinous material.

5. The method oftreating cotton fabric which 40 consists in applying to the surface thereof a solution of cupra ammonium and treating the same with an alkaline sulphide solution, the alkaline solution containing mixed therein a sugar selectedfromthegroumconsistingofcorhsyrup,

glucose orinvert sugar, to prevent oxidation of the resulting sulphides and finally impregnating said treated fabric with a resinous material to which there has been added a metallic soap.

CLARINCE B. WHI'I'E. 

